Which of the Following Are Commonly Used as Alternate Standard

Multiple Choice

Which of the following are commonly used as alternate standard electrodes:
I.Ag(s) | AgCl(s) | Cl^- ((aq,1.0 M)
II.Hg(l) | HgCl₂(s) | Cl^- (aq,1.0 M)
III.Ag(s) | AgCl(s) | Cl^- ((aq,1.0 M)
IV.Hg(l) | Hg₂Cl₂(s) | Cl^- (aq,1.0 M)
V.Hg(s) | Hg₂Cl₂(s) | Cl^- (aq,1.0 M)

A) I and V
B) II and IV
C) I and IV
D) II and III
E) I and III